It works fine for me, I can send it via gmail and download it from the Zimbra Web UI or Zimbra Desktop. What error messages do you see in the log files? What error messages do you see when you try to download the attachment? What is the maximum size for messages on your Server? I assume this is with ZImbra Collaboration Suite?

This message is blocked on server, it don't pass to account (webmail).
It's blocked "somewhere" but i don't get any (response, for example i should get "Delivery error", but i don't get it, that's why i'm so nervous for that.

If i know "message not send", but there message is sended and get into black hole.

You don't have to repeat it, I read it the first time. I also asked you what the maximum message is for download, what's the answer? Does this only happen with this type of file extension? Has it just started happening? I assume you've also disabled AppArmor on this server?

I assume you have valid DNS records for your server? Run the following (on the Zimbra server) and post the output:

Well, the file passed the a/v & a/s on my system as I said I was able to receive and download (and play) that file with the web ui & ZD. So as you seem to know where the problem is I'll leave you to it.

Unnable to send messages through desktop client with attachments

I am having a fairly general issue with the same kind of problem.
My users with the desktop client or the MS Outlook integration are experiencing issues sending attachments. These messages can be sent through the web client, but not the desktop.

I have checked values for email sizes and they are 15MB. the files range from 1MB to 11MB that are failing. Types are everything from PDF, MP3, and XLSpreadsheets.